| Issue |
Europhys. Lett.
Volume 49, Number 6, March 2000
|
|
|---|---|---|
| Page(s) | 735 - 741 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00212-8 | |
| Published online | 01 September 2002 | |
What is the entanglement length in a polymer melt?
1
Max-Planck-Institut für Polymerforschung -
Postfach 3148, D-55021 Mainz, Germany
2
Sandia National Laboratories -
Albuquerque, NM 87185-1411, USA
Received:
26
November
1999
Accepted:
17
January
2000
We present the results of molecular dynamics simulations of very long model
polymer chains analyzed by various experimentally relevant techniques.
The segment motion of the chains is found to be in very good agreement with
the reptation model. For comparison with experimental results we also
calculated the plateau modulus 
via stress-strain simulations.
The predictions of the entanglement length Ne from and from the
mean-square dispacement of the chain segments disagree by a factor of about
2.3(2), indicating an error in the prefactor in the standard formula for
which is important for the analysis of many simulation results
as well as the interpretation of experimental neutron spin echo (NSE)
and NMR measurements. We explicitly show how recent NSE measurements
are affected by this and some finite-size effects in the interpretation
of the dynamic structure factor.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling
© EDP Sciences, 2000
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